Method and apparatus for providing channel sharing among white space networks

ABSTRACT

A method and an apparatus for providing channel sharing are disclosed. For example, the method receives a request for a white space channel assignment, and identifies one or more white space channels in accordance with the request. The method sends a response to the request comprising a white space channel assignment, wherein the white space channel assignment assigns one of the identified one or more white space channels.

The present disclosure relates generally to communication networks and,more particularly, to a method and apparatus for providing channelsharing among white space networks, e.g., among white space networkscommunicating over an Internet Protocol (IP) network, an IP MultimediaSubsystem (IMS) network, and the like.

BACKGROUND

A user may wish to use a frequency that is unlicensed for broadcasttelevision for communication within a local area network. For example,the user may wish to use a white space channel (e.g., an unused channelin the spectrum that is allocated for television broadcasting), forcommunication. However, two or more devices may autonomously select thesame white space channel from among a plurality of available white spacechannels. This will create interference between various users of suchwhite space channels.

SUMMARY

In one embodiment, the present disclosure describes a method and anapparatus for providing white space channel sharing. For example, themethod receives a request for a white space channel assignment, andidentifies one or more white space channels in accordance with therequest. The method sends a response to the request comprising a whitespace channel assignment, wherein the white space channel assignmentassigns one of the identified one or more white space channels.

In one alternate embodiment, the method sends a request for a whitespace channel assignment by a gateway. The method then receives aresponse to the request, where the response comprises a white spacechannel that is available based on a location of the gateway.

BRIEF DESCRIPTION OF THE DRAWINGS

The teaching of the present disclosure can be readily understood byconsidering the following detailed description in conjunction with theaccompanying drawings, in which:

FIG. 1 illustrates an exemplary network related to the presentinvention;

FIG. 2 illustrates an exemplary network in accordance with oneembodiment of the current disclosure for providing channel sharing amongwhite space networks;

FIG. 3 illustrates a flowchart of a method for providing channel sharingamong white space networks;

FIG. 4 illustrates a flowchart of a method for channel sharing by awhite space network; and

FIG. 5 illustrates a high-level block diagram of a general-purposecomputer suitable for use in performing the functions described herein.

To facilitate understanding, identical reference numerals have beenused, where possible, to designate identical elements that are common tothe figures.

DETAILED DESCRIPTION

The present disclosure broadly describes a method and apparatus forproviding channel sharing among networks, e.g., white space networks.Although the present disclosure is discussed below in the context ofwhite space networks communicating with IP networks, e.g., InternetProtocol (IP) Multimedia Subsystem (IMS) networks, the presentdisclosure is not so limited. Namely, the present disclosure can beapplied to packet networks in general, e.g., Voice over InternetProtocol (VoIP) networks, Service over Internet Protocol (SoIP)networks, and the like. More broadly, this disclosure refers to whitespace networks communicating over any type of networks that allowconnection with a geo-location database as further described below.

To better understand the present invention, FIG. 1 illustrates anexample network 100, e.g., an Internet Protocol (IP) MultimediaSubsystem network related to the present invention. An IP network isbroadly defined as a network that uses Internet Protocol to exchangedata packets. Exemplary IP Multimedia Subsystem (IMS) networks includeInternet protocol (IP) networks such as Voice over Internet Protocol(VoIP) networks, Service over Internet Protocol (SoIP) networks, and thelike.

In one embodiment, the network 100 may comprise a plurality of endpointdevices 102-104 configured for communication with the core IMS network110 (e.g., an IP based core backbone network supported by a serviceprovider) via an access network 101. Similarly, a plurality of endpointdevices 105-107 are configured for communication with the IMS corepacket network 110 via an access network 108. The network elements 109and 111 may serve as gateway servers or edge routers for the network110.

The endpoint devices 102-107 may comprise customer endpoint devices suchas personal computers, laptop computers, Personal Digital Assistants(PDAs), mobile phones, smart phones, and the like. The access networks101 and 108 serve as a conduit to establish a connection between theendpoint devices 102-107 and the Network Elements (NEs) 109 and 111 ofthe IMS core network 110. The access networks 101 and 108 may eachcomprise a Digital Subscriber Line (DSL) network, a broadband cableaccess network, a Local Area Network (LAN), a Wireless Access Network(WAN), a 3^(rd) party network, a cellular network, and the like. Theaccess networks 101 and 108 may be either directly connected to NEs 109and 111 of the IMS core network 110, or indirectly through anothernetwork.

Some NEs (e.g., NEs 109 and 111) reside at the edge of the IMS coreinfrastructure and interface with customer endpoints over various typesof access networks. An NE that resides at the edge of a coreinfrastructure is typically implemented as an edge router, a mediagateway, a proxy server, a border element, a firewall, a switch, and thelike. An NE may also reside within the network (e.g., NEs 118-120) andmay be used as a SIP server, an application server, a core router, orlike device.

The IMS core network 110 also comprises a Home Subscriber Server (HSS)127, a Serving—Call Session Control Function (S-CSCF) 121, a MediaServer (MS) 125, and an Application Server 112 that contains a database115. The S-CSCF of the calling party and the S-CSCF of the called partyare also referred to as the originating S-CSCF and the terminatingS-CSCF, respectively. An HSS 127 refers to a network element residing inthe control plane of the IMS network that acts as a central repositoryof all customer specific authorizations, service profiles, preferences,etc.

The S-CSCF 121 resides within the IMS core infrastructure and isconnected to various network elements (e.g., NEs 109 and 111) using theSession Initiation Protocol (SIP) over the underlying IMS based corebackbone network 110. The S-CSCF 121 may be implemented to registerusers and to provide various services (e.g., VoIP services). The S-CSCFinteracts with the appropriate VoIP/SoIP service related applicationsservers (e.g., 112) when necessary. The S-CSCF 121 performs routing andmaintains session timers. The S-CSCF may also interrogate an HSS toretrieve authorization, service information, user profiles, etc. Inorder to complete a call that requires certain service specificfeatures, the S-CSCF may need to interact with various applicationservers (e.g., various VoIP servers). For example, the S-CSCF may needto interact with another server for translation of an E.164 voicenetwork address into an IP address, and so on.

The Media Server (MS) 125 is an application server that typicallyhandles and terminates media streams to provide services such asannouncements, bridges, and Interactive Voice Response (IVR) messagesfor VoIP service applications. The media server also interacts withcustomers for media session management to accomplish tasks such asprocess requests.

The application server 112 may comprise any server or computer that iswell known in the art, and the database 115 may be any type ofelectronic collection of data that is also well known in the art. Itshould be noted that the communication system 100 may be expanded byincluding additional endpoint devices, access networks, networkelements, application servers, etc. without altering the scope of thepresent invention. The above IP network is only described to provide anillustrative environment in which packets for voice, data, andmultimedia services are transmitted on networks.

The United States Federal Communications Commission (FCC) has releasedunused portions of the spectrum in the frequency range of 54 MHz-698MHz, which were previously reserved for television broadcasts, for usewithout a license. A channel that allows unlicensed use in thisfrequency range is referred to as a white space channel. A user may wishto use a channel in the unlicensed spectrum for communication within alocal area network of the user. For example, a user may want to use thewhite space channel for local use, e.g., in a local area network thatinterconnects a plurality of networked devices throughout the home ofthe user. The white space channels are attractive for communicationbecause the transmitted signals travel long distances and are able topenetrate structures, e.g., walls in buildings and so on. However, Inorder to prevent interference with licensed channels, e.g., televisionbroadcasts, in the same spectrum, and other users who are alsointerested in using the available white space channels, spectrum sensingtechnology can be employed.

Sensing technology refers to a technology that enables a device todetermine if there is transmission on a particular channel at aparticular time. The spectrum sensing enables the device to identifyavailable channels at a specific time. Once the available channels areidentified, the device makes a selection of a channel from among thechannels identified as being available. However, by the time the devicestarts transmitting on the selected channel, the channel may suddenlybecome unavailable. For example, each of a plurality of devices may runits own spectrum sensing method and identify a channel as beingavailable. As a result, it is possible that the plurality of devices mayactually select the same channel, thereby resulting in interference. Inanother example, spectrum sensing may be performed during a period ofinactivity by a licensed user such a broadcasting television stationtemporarily off the air. That is, the channel may in-fact be licensed,but appears to a device to be an unlicensed white space channel. Whenthe activity by the licensed user resumes, interference may occur.

In one embodiment, the current method enables a network service providerto enable white space channel sharing among various networks, e.g.,white space networks. For example, a customer of the service providermay implement a White Space Local Area Network (WSLAN) to enablecommunication among a plurality of networked devices, e.g., deployed atthe customer premises, e.g., a home or an office (broadly a locallocation of a user). For example, the customer may have one or morecomputers, printers, messaging devices, data input/output devices, settop boxes, gaming consoles, and the like that need to communicatewirelessly and exchange packets. The customer may then prefer toimplement a WSLAN to enable the one or more devices to communicate via awhite space channel (i.e., an unlicensed channel).

In one embodiment, the customer may then implement a WSLAN gateway forcommunicating with a geo-location database. A geo-location databasecontains the physical locations of licensed users and their associatedlicensed channels. For example, a local television station will registerits spectrum (i.e., licensed channel(s) and broadcast location(s)) suchthat other devices are able to avoid using the licensed channels. Toillustrate, a particular channel (e.g., channel 40) may be a licensedchannel in one geographical location, e.g., Denver, Colo., but may be anunlicensed white space channel in another geographical location, e.g.,Orlando, Fl.

As such, in one embodiment, a WSLAN gateway may interact with ageo-location database to identify the channels that are not being usedby licensed users and then make a white space channel selection. Forexample, the WSLAN of a particular customer may communicate with thegeo-location database over a communication network, e.g., the Internet,an IMS network, and the like, to access the information stored on thegeo-location database. In one embodiment, the WSLAN gateway is alsocapable of determining its own physical location, e.g., through initialsetup configuration or the subsequent use of Global Positioning System(GPS) technology and the like. For example, the WSLAN gateway is able todetermine its own latitude and longitude to within 50 meters ofaccuracy.

In one embodiment, the current method enables the network serviceprovider to provide white space channel sharing among a plurality ofcustomers, wherein each customer implements a WSLAN. For example, awhite space usage manager can be implemented by the network serviceprovider or a third party. Broadly, the white space usage manager (e.g.,implemented as an application server) is designed to optimize spectrumresource usage among WSLANs that are serviced by the white space usagemanager. More specifically, the optimization allows usage of availablewhite space channels by various WSLANs in a coordinated manner tominimize interference.

In one embodiment, the optimization of the spectrum resource usagecomprises optimizing channel selection for each of the WSLANs. Forexample, if there is a plurality of unlicensed white space channelsavailable for a location, the white space usage manager will selectivelyassign the unlicensed channels, such that adjacent WSLANs will not usethe same channel. Namely, the white space usage manager leverages itsoverall knowledge of the white space channels that have already beenassigned to effect a frequency re-use that prevents the same channelfrom being used by adjacent WSLANs. In fact, the white space usagemanager might even re-assign the channel “mid-stream” for an operatingWSLAN under certain conditions in order to optimize overall spectrumuse.

In one embodiment, the optimization of the spectrum resource usagecomprises a coordination of transmission times among WSLANs that use thesame channel. For example, two or more adjacent WSLANs (e.g., within a200 m distance) may each have a need for using a white space channel forpacket transmission, but the number of packets for each transmission mayactually be small. A single white space channel may then be shared bythe two or more WSLANs by ensuring that the transmission times arecoordinated in a manner to avoid overlapping transmissions.

In one embodiment, the white space usage manager may assign a singlewhite space channel to two or more non-adjacent WSLANs that areseparated by a sufficient distance that will ensure that interferencewill not result from the use of the same white space channel by multiplenon-adjacent WSLANs. In other words, the white space usage manager willuse the location information reported by the WSLAN gateways of thevarious WSLANs to ensure proper white space channel assignment. Broadly,it should be noted that “adjacent” and “non-adjacent” is intended to bedefined by an amount of relative distance separating two WSLANs and doesnot mean that the WSLANs are physically next to each other. In otherwords, for example if two WSLANs are using the same channel and there isinterference between the two WSLANs, then the two WSLANs can be deemedto be adjacent. Whereas, if two WSLANs are using the same channel andthere is no interference between the two WSLANs, then the two WSLANs canbe deemed to be non-adjacent.

In one embodiment, the network service provider is tasked with themanagement of the limited availability of white space channels. Forexample, in some locations, the network service provider or a thirdparty operating the white space manager may determine that there areonly a limited number of unlicensed channels to meet the demand of alarge number of customers who are requesting the usage of white spacechannels. In such a scenario, the network service provider may have toexercise a greater degree of coordination. For example, the networkservice provider may coordinate the transmission times to allow sharingof a single channel among adjacent WSLANs. In another example, thenetwork service provider may determine the bandwidth needs of thevarious WSLANs before channel assignment. By knowing the bandwidthneeds, the white space usage manager, may enable two adjacent WSLANs,each of which has a limited bandwidth need, to share a single channel.In turn, the white space usage manager may allow another availablechannel to be used by a customer with a higher bandwidth transmissionneed. That is, the white space usage manager is able to optimize theusage of available spectrum resources by as many customers as possiblewhile ensuring that such white space spectrum usage will not cause anyinterference.

In operation, each gateway for a WSLAN communicates with the white spaceusage manager to request a channel for use by the particular WSLAN thatthe gateway serves. In one embodiment, the request may comprise one ormore of: a physical location of the WSLAN or WSLAN gateway (e.g.,latitudinal and longitudinal information), a desired time duration ofuse of the channel for packet transmission, bandwidth requirements(e.g., the estimated number of packets to be transmitted, the packettransmission rate, and the like) and so on.

The white space usage manager may then receive the request from thegateway for the WSLAN and communicate with a geo-location database toidentify one or more unlicensed channels that are available forselection at the physical location of the WSLAN. For example, therequest includes the physical location of the WSLAN and/or the gatewayitself. The white space usage manager then selects an available channelfor the WSLAN and notifies the gateway serving the WSLAN. For example,the white space usage manager sends a response to the gatewayidentifying a particular channel that the WSLAN may use.

In one embodiment, the response to the gateway may also comprise atransmission time (broadly a time duration that the channel is assignedfor use to a particular customer). For example, if the channel is alsobeing used by another WSLAN, the response may include transmission timeintervals or transmission time sequences to allow coordination amongWSLANs that are sharing the same channel, without causing interference.

In one embodiment, the response to the gateway may comprise a request tothe gateway to notify the white space usage manager when thetransmission is completed. In other words, the white space usage manageris requesting that the gateway provide an affirmative notification thatthe previously assigned channel is no longer needed. For example, thewhite space usage manager may release the channel for use to secondWSLAN when notified of completion of a transmission by a first WSLANthat was previously assigned the channel or a time slot associated withthe assigned channel.

In one embodiment, the white space usage manager may queue requests forchannels and/or timeslots such that channels and/or timeslots areassigned as they become available. For example, a gateway for a WSLANthat was previously assigned a channel may notify the white space usagemanager that the task (transmission) is completed. The white space usagemanager may then assign the channel or timeslot to another WSLAN.

In one embodiment, a channel or a transmission timeslot may be assignedfor the duration that the gateway requested and automatically releasedat the end of the requested duration. In other words, the white spaceusage manager may indicate to the gateway that the channel is assignedto a particular WSLAN for only a predefined time interval. At the end ofthe predefined interval, the particular WSLAN is expected to cease itsuse of the assigned channel, and the white space usage manager is freeto re-assign the channel to another WSLAN.

In one embodiment, the white space usage manager enables a WSLAN gatewayto request an extension of time for using a white space channel. Forexample, an initial request may be for using a white space channel forone minute. However, at a later time, the gateway may determine that thetask will not be completed within the requested transmission time. Thegateway may then send another request to the white space usage managerfor an extension of time. The white space usage manager may then analyzethe request, and extend the time or assign a new channel such that thetask can be completed.

In one embodiment, the white space usage manager can be implemented asan application server in communication with the WSLANs via the serviceprovider's network. For example, the white space usage manager can be anapplication server implemented by the service provider for optimizingusage of white space spectrum resources for customers of the serviceprovider.

In one embodiment, the white space usage manager may interact with adesignated WSLAN among a plurality of WSLANs that are located within apredetermined area. For example, one of the WSLAN gateways can bedesignated by the other WSLAN gateways in the same neighborhood forcoordinating usage of spectrum resources. For example, each WSLAN in theneighborhood may send its physical location to the designated gateway.The designated gateway may then identify unlicensed channels bycommunicating with the white space usage manager and/or a geo-locationdatabase. The designated gateway may then coordinate with each WSLAN inthe neighborhood with respect to available channels or time slots ineach available channel, thereby ensuring that no WSLANs will causeunnecessary interference. This will alleviate the management burden ofthe white space usage manager and allows local or distributed whitespace spectrum coordination.

FIG. 2 illustrates an exemplary network 200 in accordance with oneembodiment of the current disclosure for providing channel sharing,e.g., among white space networks. In one embodiment, the network 200comprises User Endpoint (UE) devices 202-206 communicating with an IMSnetwork 110 to access a service with white space channel sharing, e.g.,via white space LAN 201 a, 201 b, or 201 n. The white space LAN 201 acomprises UE devices 202 and 203 and WSLAN gateway 220. The UE devices202 and 203 communicate with the IMS network 110 via the WSLAN gateway220 and NE 109. The white space LAN 201 b comprises UE devices 204 and205 and WSLAN gateway 221. The UE devices 204 and 205 communicate withthe IMS network 110 via the WSLAN gateway 221 and NE 109. The whitespace LAN 201 n comprises UE device 206 and WSLAN gateway 222. The UEdevice 206 communicates with the IMS network 110 via the WSLAN gateway222 and NE 109. For illustration, the IMS core network comprises an NE109, an S-CSCF 121, HSS 127, a white space usage manager 212 and adatabase 215.

It should be noted that although the WSLAN gateway 220 is illustrated asa separate module in FIG. 2, the present disclosure is not so limited.In other words, the WSLAN gateway need not be physically distinct fromthe UE devices. In WSLAN 201 a, for example, the gateway could be aprogram running on the computer 203 and so on.

It should be noted that the IMS network 110 and the white space LANs maycomprise any number of other network devices. For clarity reasons, thepresent disclosure only includes those components that are used todescribe the various embodiments as discussed above.

It should also be noted that the WSLANs 201 a, 201 b and 201 n maycommunicate with the IMS 110 via a variety of different communicationsmedia and different network elements that reside at the edge of the IMScore network. For example, communication links 250, 251 and 252 may bewireless network based, wire based, etc.

In one embodiment, a customer of the network service provider may thensubscribe to a channel sharing service via a user endpoint devicecommunicating with an HSS 127 via a respective WSLAN gateway and NE 109.For example, a user with the endpoint device 202 may subscribe to achannel sharing service by communicating with the HSS 127 located in theIMS core network 110 via the WSLAN gateway 220. Similarly, users of theWSLAN 201 b and 201 n may also subscribe to the channel sharing service.Broadly, the “user” is to be interpreted to include an owner of theWSLAN. As such, in one embodiment, it is the owner of the WSLAN gatewaywho would subscribe to the channel-sharing service, rather than theseparate owners or users of the UE devices.

The WSLAN gateways 220-222 interact with the white space usage manager212 to identify an available white space channel and/or timeslot fortransmission. For example, the WSLAN gateway 220 may send a request foran available white space channel or timeslot to the white space usagemanager. The request may comprise one or more of: a location of theWSLAN or WSLAN gateway, a time duration of transmission, a type ofrequest (e.g., an extension of a previous request, a new request, etc.),a bandwidth need (e.g., number of packets to be transmitted, rate ofpacket transmission, etc.).

In one embodiment, the white space usage manager 212 interacts with ageo-location database 230 to identify available unlicensed channels (oralternatively licensed channels that cannot be used) in accordance withthe received request. For example, the unlicensed channels can beidentified based on the location of the requesting WSLAN gateway. Thewhite space usage manager 212 may then analyze the response from thegeo-location database, the request from the WSLAN gateway 220, and adatabase of assigned white space channels and timeslots to determine alist of white space channels or timeslots that are available forassignment. For example, the white space usage manager may maintain adatabase of known white space channel and/or timeslot assignments in thedatabase 215. The white space usage manager 212 then determines anoptimal assignment based on the overall knowledge. For example, amongavailable channels, the white space usage manager 212 may assigndifferent channels to adjacent WSLANs. For example, if the knownlocations for WSLAN gateways 220 and 221 are such that the WSLANs areunable to share the same channel, the white space usage manager willassign the WSLAN gateways 220 and 221 different channels.

The white space usage manager 212 may then provide a response to theWSLAN gateway, wherein the response comprises an optimally assignedchannel or timeslot. The response may further comprise one or more of:an assigned transmission time or duration, a request for notificationwhen transmission on the white space channel is completed, etc.

The WSLAN gateway 220 may then receive the response from the white spaceusage manager and notify the respective user endpoint device(s) of thewhite space channel/timeslot assignment. The user endpoint devices maythen use the white space channel for transmission in accordance with therequirements specified in the response received from the white spaceusage manager 212. If an extension of time, a new request, etc. isneeded, the WSLAN gateway may then send another request (e.g., based oncurrent need) to the white space usage manager.

In one embodiment, the white space usage manager is located in theservice provider's network. For example, the white space usage managermay be implemented in an application server managed by the serviceprovider. In another embodiment, the white space usage manager may beexternal to the network that is managed by the service provider. Theservice provider may then access the white space usage manager as neededvia a communication link. However, if the white space usage manager isoperated by a third party other than the service provider, then it isthe third party that will access the white space usage manager and theservice provider is simply providing a connection between the WSLANgateway and the white space usage manager.

In one embodiment, if the WSLANs 201 b and 201 n are deemed to beconnected via a path independent of network 110, then the WSLANs 201 band 201 n can implement local coordination as discussed above. In otherwords, one of the WSLAN gateways 221 or 222 can be a designated gatewayfor coordinating the usage of available white space spectrum throughlocal communications (shown as a dashed line) between the two adjacentWSLANs 201 b and 201 n.

FIG. 3 illustrates a flowchart of a method 300 for providing channelsharing, e.g., among white space networks. In one embodiment, one ormore steps of method 300 for sharing white space channels can beimplemented in an application server. Method 300 starts in step 305 andproceeds to step 310.

In step 310, method 300 receives a request for a white space channelassignment. For example, the method may receive a request for a whitespace channel assignment from a WSLAN gateway serving a WSLAN of acustomer.

In one embodiment, the request may comprise one or more of: a locationof the WSLAN or WSLAN gateway, a duration of transmission, a type ofrequest (e.g., an extension of a previous request, a new request, etc.),a bandwidth need (e.g., number of packets to be transmitted, packettransmission rate, etc.).

In step 320, method 300 identifies one or more white space channels inaccordance with the received request. For example, the licensed channelsand their locations are registered in the geo-location database 230. Themethod may then interact with the geo-location database to identifyavailable unlicensed channels for a location identified in the request.For example, the method may identify a channel as being a white spacechannel if it is not registered in the geo-location database as alicensed channel.

In step 330, method 300 assigns one of the identified one or more whitespace channels. For example, the method may analyze the responsereceived from the geo-location database to identify a list of whitespace channels for a physical location in accordance with the request.The method may also obtain a record of white space channels that arealready assigned and/or being used. For example, the method may maintaina database of assignments and retrieve the data for analysis. The methodthen determines an optimal assignment based on the overall knowledge ofthe white space channels that are assigned, proximity to other whitespace users (same or different channel), desired duration oftransmission, bandwidth (e.g., packet size), etc. In one example, amongavailable channels, the method may assign different channels to adjacentwhite space users.

In one embodiment, the assignment may comprise assigning a timeslot on awhite space channel to each of a plurality of users such that thechannel is shared by the plurality of users by enabling each user totransmit on the shared channel during only an assigned timeslot. Forexample, the method may assign different timeslots on the same whitespace channel to a plurality of users such that the same channel isshared by the plurality of users by having each of the plurality ofusers limiting their respective transmission to a specific assignedtimeslot.

In step 340, method 300 sends a response to the request comprising anassignment of a white space channel. For example, the method may send anoptimally assigned channel or timeslot. In one embodiment, the responsemay comprise one or more of an assigned transmission timeslot, atransmission duration, a request for notification when transmission iscompleted, etc.

In optional step 350, method 300 updates a database 215 in accordancewith the assignment of the white space channel. For example, if achannel has just been assigned at a location, the method updates thedatabase such that the updated data can be used during a subsequentanalysis. The method may then proceed to an optional step 360.

In optional step 360, method 300 determines if a request to release thewhite space channel is received. For example, a customer may havecompleted the communication using the assigned white space channel. Atthe conclusion of the communication, the customer may then send anotification such that the channel may be assigned for other requests.Alternatively, an internal timer can be used to determine whether atransmission time or duration has elapsed such that a previouslyassigned white space channel can be released for re-assignment. If arequest to release the white space channel is received, the methodproceeds to step 370. Otherwise, the method proceeds to step 395 to endprocessing the current request or returns to step 310 to continuereceiving requests.

In optional step 370, method 300 releases the white space channel inaccordance with the received request to release. The method thenproceeds to step 380.

In optional step 380, method 300 updates the database in accordance withthe release of the white space channel. The method then proceeds to step395 to end processing the current request or returns to step 310 tocontinue receiving requests.

FIG. 4 illustrates a flowchart of a method 400 for channel sharing by awhite space network. In one embodiment, one or more steps of method 400for sharing white space channels can be implemented in a network deviceserving as a gateway for a white space LAN. Method 400 starts in step405 and proceeds to step 410.

In step 410, method 400 determines a need to use a white space channel.For example, a gateway for a WSLAN may receive a request for a whitespace channel from a user endpoint device in the WSLAN for packettransmission. The gateway may then assess the need by identifying thenecessary bandwidth, duration of transmission, etc. For example, if theuser endpoint device needs to send a file to a printer on the WSLAN, thegateway can assess the size of the file to be printed, therebydetermining the needed bandwidth and/or the estimated transmission time.

In step 415, method 400 requests a white space channel assignment inaccordance with the need. For example, the method may send a request toa white space usage manager of the customer's service provider or to athird party. In one embodiment, the request may comprise one or more of:a location of the WSLAN, a duration of transmission, a type of request(e.g., an extension of a previous request, a new request, etc.), abandwidth need (e.g., number of packets to be transmitted, rate ofpacket transmission, etc.).

In step 420, method 400 receives a response to the request for the whitespace channel assignment. The method then proceeds to step 425.

In step 425, method 400 determines if a white space channel assignmentis received. If a white space channel assignment is received, the methodproceeds to optional step 430. Otherwise, the method proceeds to step415 where another request is made.

In one example, a white space channel is available and the requestcomprises an assignment. In one example, a white space channel isunavailable and the response comprises a denial of request (rejection).In one example, a white space channel is available for a futureduration, wherein the duration is assigned. For example, a channel maybe expected to be freed and the assignment may be made based on a queueof requests. In one example, a white space channel may be assigned forsharing with other WSLANs based on assignment of specific timeslots.That is, each user may transmit in specific timeslots allowing thechannel to be shared among a plurality of WSLANs.

In optional step 430, method 400 provides the received white spacechannel assignment to the user. For example, the gateway may provide thewhite space channel assignment (e.g., channel, duration, timeslot, etc.as needed) to the user endpoint device that originated the request. Inone embodiment, the gateway may actually be the requesting device thatneeded to use the white space channel. In that case, the gateway willnot need to forward the assignment of the white space channel to anothernetwork device.

In step 435, method 400 uses the white space channel for transmission inaccordance with the received assignment. For example, the method may usethe specific white space channel (frequency) that it is assigned for aduration that is assigned.

In optional step 440, method 400 determines if use of the white spacechannel is completed. For example, a computer may send requests to aprinter in the same WSLAN using the assigned white space channel and theprinting job has completed. If the usage of the white space channel iscompleted, the method proceeds to optional step 460. Otherwise, themethod proceeds to step 445.

In optional step 445, method 400 determines if there is a need forrequesting an extension of time for using the white space channel. Forthe example above, the printing time may be taking longer than the timeduration in the original request. If there is a need for requesting foran extension of time, the method proceeds to step 415. Otherwise, themethod proceeds to step 435.

In optional step 460, method 400 reports a release of a white spacechannel. For the example above, the method may finish printing. Themethod then notifies the service provider such that the channel is madeavailable for another assignment. In one embodiment, reporting of arelease may have been requested by the service provider, e.g., by awhite space usage manager of the service provider. In one embodiment,the release is sent to relinquish the white space channel assignmentsuch that availability of channels for all users may be improved (e.g.,via an honor system). The method may then proceed to step 495 to endprocessing the current white space channel request or return to step 410to determine other white space channel needs.

It should be noted that although not specifically specified, one or moresteps of method 300 or method 400 may include a storing, displayingand/or outputting step as required for a particular application. Inother words, any data, records, fields, and/or intermediate resultsdiscussed in the method can be stored, displayed and/or outputted toanother device as required for a particular application. Furthermore,steps or blocks in FIG. 3 or FIG. 4 that recite a determining operationor involve a decision, do not necessarily require that both branches ofthe determining operation be practiced. In other words, one of thebranches of the determining operation can be deemed as an optional step.

FIG. 5 depicts a high-level block diagram of a general-purpose computersuitable for use in performing the functions described herein. Asdepicted in FIG. 5, the system 500 comprises a processor element 502(e.g., a CPU), a memory 504, e.g., random access memory (RAM) and/orread only memory (ROM), a module 505 for providing channel sharing, andvarious input/output devices 506 (e.g., storage devices, including butnot limited to, a tape drive, a floppy drive, a hard disk drive or acompact disk drive, a receiver, a transmitter, a speaker, a display, aspeech synthesizer, an output port, and a user input device (such as akeyboard, a keypad, a mouse, and the like)).

It should be noted that the present disclosure can be implemented insoftware and/or in a combination of software and hardware, e.g., usingapplication specific integrated circuits (ASIC), a general purposecomputer or any other hardware equivalents. In one embodiment, thepresent module or process 505 for providing channel sharing among whitespace networks can be loaded into memory 504 and executed by processor502 to implement the functions as discussed above. As such, the presentmethod 505 for providing channel sharing (including associated datastructures) of the present disclosure can be stored on a computerreadable storage medium, e.g., RAM memory, magnetic or optical drive ordiskette and the like.

While various embodiments have been described above, it should beunderstood that they have been presented by way of example only, and notlimitation. Thus, the breadth and scope of a preferred embodiment shouldnot be limited by any of the above-described exemplary embodiments, butshould be defined only in accordance with the following claims and theirequivalents.

1. A method for providing channel sharing, comprising: receiving arequest for a white space channel assignment; identifying one or morewhite space channels in accordance with the request; and sending aresponse to said request comprising a white space channel assignment,wherein said white space channel assignment assigns one of theidentified one or more white space channels.
 2. The method of claim 1,further comprising: releasing said one of the identified one or morewhite space channels in accordance with a request to release said whitespace channel assignment.
 3. The method of claim 2, further comprising:updating a database in accordance with said releasing of said one of theidentified one or more white space channels.
 4. The method of claim 1,further comprising: releasing said one of the identified one or morewhite space channels in accordance with an elapsed time period.
 5. Themethod of claim 1, further comprising: updating a database in accordancewith said white space channel assignment of said white space channel. 6.The method of claim 1, wherein said request comprises one or more of: alocation of a White Space Local Area Network (WSLAN), a location of aWSLAN gateway, a duration of transmission, a type of request, or abandwidth need.
 7. The method of claim 1, wherein said white spacechannel assignment comprises one or more timeslots of said one of theidentified one or more white space channels.
 8. A computer-readablestorage medium having stored thereon a plurality of instructions, theplurality of instructions including instructions which, when executed bya processor, cause the processor to perform steps of a method forproviding channel sharing, comprising: receiving a request for a whitespace channel assignment; identifying one or more white space channelsin accordance with the request; and sending a response to said requestcomprising a white space channel assignment, wherein said white spacechannel assignment assigns one of the identified one or more white spacechannels.
 9. The computer-readable storage medium of claim 8, furthercomprising: releasing said one of the identified one or more white spacechannels in accordance with a request to release said white spacechannel assignment.
 10. The computer-readable storage medium of claim 9,further comprising: updating a database in accordance with saidreleasing of said one of the identified one or more white spacechannels.
 11. The computer-readable storage medium of claim 8, furthercomprising: releasing said one of the identified one or more white spacechannels in accordance with an elapsed time period.
 12. Thecomputer-readable storage medium of claim 8, further comprising:updating a database in accordance with said white space channelassignment of said white space channel.
 13. The computer-readablestorage medium of claim 8, wherein said request comprises one or moreof: a location of a White Space Local Area Network (WSLAN), a locationof a WSLAN gateway, a duration of transmission, a type of request, or abandwidth need.
 14. The computer-readable storage medium of claim 8,wherein said white space channel assignment comprises one or moretimeslots of said one of the identified one or more white spacechannels.
 15. A method for sharing a channel, comprising: sending arequest for a white space channel assignment by a gateway; and receivinga response to said request, where said response comprises a white spacechannel that is available based on a location of said gateway.
 16. Themethod of claim 15, further comprising: sending a request to releasesaid white space channel.
 17. The method of claim 15, wherein saidresponse further comprises one or more timeslots associated with saidwhite space channel.
 18. The method of claim 15, wherein said responsefurther comprises a time duration associated with said white spacechannel.
 19. The method of claim 18, further comprising: sending asecond request for an extension of time after said time duration haselapsed.
 20. The method of claim 15, wherein said request is sent to anetwork service provider, wherein said gateway is located at a locallocation of a user.